43040121 has 16 divisors (see below), whose sum is σ = 59424768. Its totient is φ = 27680400.

The previous prime is 43040117. The next prime is 43040167. The reversal of 43040121 is 12104034.

It is not a de Polignac number, because 43040121 - 2² = 43040117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43040121.

It is not an unprimeable number, because it can be changed into a prime (43040191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42936 + ... + 43926.

It is an arithmetic number, because the mean of its divisors is an integer number (3714048).

Almost surely, 2^43040121 is an apocalyptic number.

It is an amenable number.

43040121 is a deficient number, since it is larger than the sum of its proper divisors (16384647).

43040121 is a wasteful number, since it uses less digits than its factorization.

43040121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 43040121 is about 6560.4970086115. The cubic root of 43040121 is about 350.4487332789.

Adding to 43040121 its reverse (12104034), we get a palindrome (55144155).

The spelling of 43040121 in words is "forty-three million, forty thousand, one hundred twenty-one".